<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>coalesce</title>
</head>

<body>
    <div>打开浏览器控制台查看结果</div>
    <script>
        const coalesce = (...args) => args.find(v => ![undefined, null].includes(v));
        console.log(coalesce(null, undefined, '', NaN, 'Waldo'));
    </script>
</body>

</html>